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2. Blackout (fabric) - Wikipedia

   en.wikipedia.org/wiki/Blackout_(fabric)

   The process of manufacturing blackout was invented by Baltimore-based Rockland Industries, [2] and involves coating a fabric with layers of foam, or 'passes'. A '2-pass' blackout is produced by applying two passes of foam to a fabric – first, a black layer is applied to the fabric, then a white or light-colored layer is applied on top of the black.

3. Window blind - Wikipedia

   en.wikipedia.org/wiki/Window_blind

   Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.

4. Greyout - Wikipedia

   en.wikipedia.org/wiki/Greyout

   A greyout can be readily reversed by lying down as the cardiovascular system does not need to work against gravity for blood to reach the brain. A greyout may be experienced by aircraft pilots pulling high positive g-forces as when pulling up into a loop or a tight turn, which forces blood to the lower extremities of the body and lowers blood ...